广西师范大学学报（自然科学版） ›› 2014, Vol. 32 ›› Issue (4): 1-5.

• •    下一篇

单个LPFG实现溶液温度和折射率测量的两种方法

陈美娟, 李传起, 罗德俊, 陆叶   

  1. 广西师范大学电子工程学院,广西桂林541004
  • 收稿日期:2014-09-03 发布日期:2018-09-26
  • 通讯作者: 李传起(1964—),男,安徽六安人,广西师范大学教授,博导。E-mail:lcq@gxnu.edu.cn
  • 基金资助:
    广西自然科学基金资助项目(20101MS018);桂林科学技术发展项目基金(20120104-18)

Two Methods for Simultaneous Measurement of Liquid Temperature and Refractive Index by a Long Period Fiber Grating

CHEN Mei-juan, LI Chuan-qi, LUO De-jun, LU Ye   

  1. College of Electronic Engineering, Guangxi Normal University, Guilin Guangxi 541004,China
  • Received:2014-09-03 Published:2018-09-26

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摘要： 长周期光纤光栅(LPFG)具有不同损耗峰,对外界环境表现出不同的灵敏度;一个损耗峰近似线性区的光强对数值与外界环境参量均具有线性关系,并且折射率在一定范围内时损耗峰中心波长与外界环境参量同样具有线性关系。本文提出两种单个光纤光栅进行温度和折射率同时测量的方法,长周期光纤光栅透射谱的两个不同阶次的损耗峰具有不同的温度和折射率灵敏度;一个损耗峰的近似线性区内光强对数值和其损耗峰同样具有不同的温度折射率灵敏度。利用这两种谱特性实现单个光栅双参数测量。对长周期光纤光栅的光谱进行理论分析和数值仿真,证实了这两种方法的可行性。单个长周期光纤光栅作为传感器较其他结构复杂的传感器的灵敏度相对较低,由于其解调简单、成本低廉、体积小巧,具有很好的应用前景。

关键词: 长周期光纤光栅(LPFG), 透射谱, 温度传感, 折射率传感

Abstract: Two schemes of using a long period fiber grating(LPFG) for simultaneous discriminating measurement of temperature and refractive index are proposed.The schemes are based on the spectrum characteristics of the long period grating. The spectrum is composed of multiple and different loss peaks.The sensitivities of the peaks are different, and the logarithm of the light intensity in an approximate linear region near the resonant wavelength is linear when the temperature and refractive index change, so is the resonant wavelength.With detailed theory and numerical simulation,it proves the feasibility. The sensor with a long period grating is less sensitive than the other sensors with complex structure. It has good application prospect because of the simple demodulation,attractive price and smaller size.

Key words: long period fiber grating(LPFG), transmission spectrum, temperature sensing, refractive index sensing

中图分类号: 

  • TP212
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